Device and method for compressing an edge of a building panel and a building panel with compressed edges
A device and method of producing a building panel with a compressed and curved edge including a press tool, a heat device and a lubricating device and a building panel with a curved edge produced by the device and method.
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The present invention generally relates to a device and a method of compressing an edge of a building panels, especially floorboards, which have a wood fibre based core and a decorative layer, to provide curved edge portions. More particularly, the present invention relates to interlocked building panels with compressed edge portions located below the panel surface. The invention relates to panels with such edge portions and to a method and device to produce such panels.
BACKGROUND OF THE INVENTIONIn particular, yet not restrictive manner, the present application concerns a device and a method of producing a laminate floor panel with a curve shaped and compressed edge. However, the application is as well applicable to building panels in general. More particularly, the application relates to the type of floor panels with a wood fibre based core, e.g. HDF, MDF, particleboard, plywood, a decorative layer and a mechanically locking system for horizontal and/or vertical locking produced by the method and device.
A device, method and floor panel of this type is presented in WO2006/088417, which discloses a device and method to compress the edges of a laminate floor panel to provide a laminate floor panel with curve shaped edges looking like a solid wood floor panel with bevelled edges.
The contents of WO2006/088417 and U.S. Ser. No. 10/906,356 are hereby incorporated herein by reference.
SUMMARYThe invention aims at an improved device and a method of producing building panels, especially floorboards, with a curved edge portion made in one piece with the decorative layer, which could be produced with high speed. The invention 5 also makes it possible to produce deeper curved edge portion compared to the known technology.
An additional purpose of this invention is to provide building panels comprising a decorative layer and a curved edge portion, produced with the device and the method.
A device, method and floor panel of this type is known from WO2006/088417, which discloses a device and method to compress the edges of a laminate floor panel, to provide a laminate floor panel with a curve shaped edge. The known device comprises a heat device and a press tool for heating and compressing the edge part of the panel.
The known method comprises the steps of:
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- Applying the decorative layer on the core to form a building element.
- Cutting the building element into building panels.
- Applying heat and pressure on the surface of an edge portion of the building panel such that the core under the decorative layer is compressed and the surface layer is permanently bent towards the rear side of the core.
A drawback of this known device and method is that cracks arise in the decorative layer if the pressure is applied to fast or if the degree of compression is to high.
One embodiment according to the invention comprises a 30 heat device, a press tool and a lubricating device for produce building panels with high speed.
Advantageously, the tool is arranged rotatable and is configured to rotate when applying the pressure on the edge of the building panel.
Preferably, the lubricating device is arranged to apply the lubricate additive at the press tool. The lubricate additive may be of any type of grease or oil easy to wipe of from the present type of decorative surface. A preferred example is synthetic teflon oil, but it is also possible to use a mineral and an organic oil with the same fluid and lubricating properties, which is possible to remove from the decorative surface.
Preferably, the heating device comprises an IR (infra red) heat element. In a preferred embodiment also the tool is heated.
Preferably, the shape of the tool comprises an elliptic groove, with a larger radius in a plane parallel to decorative surface and consequently the smaller in a plane vertical to the decorative surface. This results in a bevel, which looks deeper/bigger.
Preferably, the surface of the tool is grinded. This results in lower friction between the decorative surface and the press tool, resulting in fewer cracks in the decorative surface.
An object of the invention is to provide an improved method to produce a building panel with a compressed edge. One embodiment of the invention includes the method comprising:
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- Heating an edge of the building panel.
- Lubricating the edge of the building panel or an press tool
- Compressing the edge of the building panel with the press tool
Advantageously, the method may also comprises heating of the tool.
Preferably, the method comprises moving the building panel relative the tool via a conveyor. The speed of the conveyor is preferably more than 50 m/s and most preferably 100 m/s or higher.
Another object is to provide an improved building panel with a curved edge, produced by the device and method afore mentioned. The building panel preferably has an elliptic outer edge. Advantageously, the core at the curve shaped edge is compressed more than 0.5 mm and most preferably more than 0.7 mm. A preferred range of compression is between 0.5 mm to 1 mm. With the method and the device according to the invention it is possible to produce a building panel with such a deep compression without cracks in the decorative surface.
Building panels with a curved edge portion are described in WO2006/088417. Two main types of curved edges are shown in WO2006/088417, the old type, which involves cutting of a part of the core at the edge of the building panel or pressing the whole building panel, forming the curve shape, and a new type involving compression of the edges. The two types may look the same but the new type has a compressed core, with higher density, at the edge. WO2006/088417 also disclose a measuring method for distinguishing the two types. A building board according to the invention is possible to distinguish from the old types with the measuring method described in WO2006/088417 and from the new type that there are fewer or no cracks in the decorative surface at the curved edge. The difference is increased with larger radius and degree of compression.
All references to “a/an/the [element, device, component, means, step, etc]” are to be interpreted openly as referring to at least one instance of said element, device, component, means, step, etc., unless explicitly stated otherwise.
As represented in
A known device and method of producing a building panel with compressed and curved edges is shown with reference to
In
An embodiment of the device and method according to the invention is illustrated in
A preferred lubricate additive is a synthetic teflon oil, but it is also possible to use a mineral and a organic oil with the same fluid and lubricating properties, which is possible to remove from the decorative surface. To reduce the friction further more, the surface of the press tool (9) may be grinded and/or tempered. As an example a material of tempered steel with a hardness of about 30-40 HRC may be used for the press tool, which may be tempered by nitro-carburizing to about 60-70 HRC and advantageously grinded to a roughness of about 0.2 Ra. Other method may be used for tempering for which a hardness may be achieved of about 30004000 Vickers. Generally, a harder and smoother press tool is desired, but leads to greater costs. For some material of the decorative layer and a compression in the lower range, it's possible to take out the lubrication and achieve the desired result by a grinded and tempered press tool.
Advantageously, the press tool (9) may be provided with a groove with a circular (50) or an elliptic shape (51, 52), which creates a corresponding circular or elliptic shape of the curved edge of the building panel. With an elliptic shape a visual effect is created that the curved edge looks deeper, if the radius of the ellipse in a direction (a), parallel to the decorative surface is larger than the radius of the ellipse in a direction (b), vertical to the decorative surface. The edge of the tool closest the middle of the building panel is preferably provided with a clearance angel (53).
The embodiment of the building panel shown in
Advantageously, the core at the curve shaped edge is compressed more than 0.5 mm and most preferably more than 0.7 mm. A preferred range of compression is between 0.5 mm to 1 mm. Also a smaller degree of compression is obviously possible, and even a larger, but a curved edge or bevel in this range looks the most natural. With the method and the device according to the invention a building panel with such a deep compression is possible to achieve without cracks in the decorative surface. The compressed edge may also comprise a straight part.
Claims
1. A system for producing a building panel with a compressed and curved edge portion, the system comprising:
- a heating device arranged to heat an edge of the building panel,
- a press tool arranged to compress a core of the building panel at the edge of the building panel,
- a lubricate additive including grease or oil, and
- a lubricating device for supplying the lubricate additive where the panel is intended to be compressed and configured to decrease the friction between a decorative surface of the curved edge portion and the press tool resulting in fewer or no cracks in the decorative surface.
2. The system as claimed in claim 1, wherein the lubricate additive is supplied to the press tool.
3. The system as claimed in claim 1, wherein the lubricate additive is supplied to the edge of the building panel.
4. The system as claimed claim 1, wherein the press tool is rotatable and is configured to rotate when applying pressure on the edge of the building panel.
5. The system as claimed in claim 1, wherein the lubricate additive is a teflon oil and said lubricating device supplies the teflon oil where the panel is compressed.
6. The system as claimed in claim 1, wherein the heating device comprises an infrared heat element.
7. The system as claimed in claim 1, wherein the heating device comprises a press tool-heating device.
8. A system as claimed in claim 1, wherein the press tool comprises a groove with an elliptic or circular shape, with a larger radius in a plane parallel to the decorative surface of the building panel and a smaller radius in a plane vertical to a decorative surface.
9. The system as claimed in claim 1, wherein the surface of the press tool is ground.
10. The system as claimed in claim 1, wherein the surface of the press tool is tempered.
11. The system as claimed in claim 1, wherein the core comprises HDF or MDF and said press tool is arranged to compress the HDF or MDF at the edge of the building panel.
12. The system as claimed in claim 1, further comprising a decorative surface that is a wood veneer or a laminate layer comprising a resin.
13. The system as claimed in claim 1, wherein a surface of the press tool directly contacts the edge of the building panel and said surface of the press tool is tempered.
14. The system as claimed in claim 1, wherein a surface of the press tool directly contacts the edge of the building panel and said surface of the press tool is ground.
15. The system as claimed in claim 1, wherein the lubricate additive consists of a grease or oil.
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Type: Grant
Filed: Sep 15, 2006
Date of Patent: Dec 4, 2012
Patent Publication Number: 20080120938
Assignee: Valinge Innovation Belgium BVBA (Brussels)
Inventors: Jan Jacobsson (Viken), Peter Wingardh (Viken)
Primary Examiner: Joseph Del Sole
Assistant Examiner: Seyed Masoud Malekzadeh
Attorney: Buchanan Ingersoll & Rooney
Application Number: 11/521,439
International Classification: E04F 13/16 (20060101);